CVE-2026-70163: Microsoft OpenSSH for Windows Denial of Service Vulnerability
Allocation of resources without limits or throttling in OpenSSH for Windows allows an unauthorized attacker to deny service over a network.
Other sources
Microsoft OpenSSH for Windows Denial of Service Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648
Event History
Frequently Asked Questions
Who can exploit this issue?
An unauthorized attacker can exploit it remotely over the network. No privileges or user interaction are required.
What is the likely impact of successful exploitation?
Successful exploitation can deny service by causing OpenSSH for Windows to allocate resources without limits or throttling. The provided data identifies availability impact only; it does not indicate confidentiality or integrity impact.
Which systems should be prioritized for review?
Review Microsoft Windows 10, Windows 11, Windows Server 2019, Windows Server 2022, and Windows Server 2025 systems that use OpenSSH for Windows and are reachable over the network.